Cross Reference: /src/sys/dev/ic/com.c

History log of /src/sys/dev/ic/com.c
Revision	Date	Author	Comments
1.388	12-Feb-2025	imil	Set a skip_attach_delay property to "true" for com port in virtual machines to avoid a delay(10000) at attach
1.387	09-Feb-2025	skrll	Trailing whitespace
1.386	20-Jan-2025	martin	Backout previous, this needs to be done differently
1.385	20-Jan-2025	imil	Avoid delay(10000) for virtual machines
1.384	11-Apr-2023	riastradh	com(4): Note ttylock in comment, not tty_lock.
1.383	11-Apr-2023	riastradh	com(4): Note timecounter_lock in lock order comments.
1.382	09-Dec-2022	knakahara	Revert com.c:r1.381 because i386/qemu cannot boot. Pointed out by gson@n.o and martin@n.o.
1.381	08-Dec-2022	knakahara	Fix hang up writing /dev/console rarely in specific environments. Some BMC seems to require these syncronous operations. If not, it does not send transmit completion interrupts for some reason.
1.380	03-Dec-2022	skrll	KNF a comment
1.379	26-Oct-2022	riastradh	ddb/db_active.h: New home for extern db_active. This can be included unconditionally, and db_active can then be queried unconditionally; if DDB is not in the kernel, then db_active is a constant zero. Reduces need for #include opt_ddb.h, #ifdef DDB.
1.378	03-Oct-2022	riastradh	com(4): Nix quirky `integrate' macro. Just use `static inline' like everything else.
1.377	03-Oct-2022	riastradh	com(4): Omit needless spltty in comstart. This is called either via tp->t_oproc, which is done with tty_lock held (thus, at IPL_VM = IPL_TTY), or from comparam which is called at IPL_TTY, either via comopen or tp->t_param.
1.376	03-Oct-2022	riastradh	com(4): Nix dead code. This was introduced in rev. 1.292, whose commit message was... `Delete dead code.' I guess December 6, 2009 was Opposite Day?
1.375	03-Oct-2022	riastradh	com(4): Comment on lock order.
1.374	03-Oct-2022	riastradh	com(4): Update confusing comment from decades ago to reflect now. No functional change.
1.373	12-Nov-2021	jmcneill	com: Add support for 32-bit IO accesses.
1.372	30-Oct-2021	jmcneill	For the DW APB busy bit workaround, only attempt to re-apply LCR and DLB settings for non-console devices. In the console case, simply clear the busy bit and continue. Fixes an interrupt storm observed on Macchiatobin.
1.371	21-Oct-2021	jmcneill	Restore 16-byte FIFO for ns16550a, accidentally lost in r1.344. Spotted by msaitoh. Thanks!
1.370	20-Oct-2021	jmcneill	- microtime -> microuptime - avoid kpause with timeo=0
1.369	14-Oct-2021	jmcneill	- use microtime instead of getmicrotime, suggested by thorpej - use ttclos for wchan even though we are sleeping in comopen now
1.368	12-Oct-2021	kre	Note that while sleeping (HUPCL), time passes. Try to avoid the otherwise infinite loop.
1.367	12-Oct-2021	kre	Now Jason has made this build, avoid a 50+ year sleep to implement HUPCL.
1.366	11-Oct-2021	jmcneill	com: speed up close with HUPCL set Instead of incurring a 1s penalty on close of a com device with HUPCL set, defer the sleep until the next open, and only sleep if necessary. This has a side effect of making `ttyflags -a` with a default install not pause for 1s for every non-console com device, which happens every boot via /etc/rc.d/ttys.
1.365	31-Jul-2021	tnn	only read cpr register if we're going to use the value
1.364	30-Jul-2021	tnn	com(4): fix FIFO for DW_APB on Allwinner A20 (got broken by com.c 1.360) Older DesignWare UARTs do not advertise their FIFO length so we must provide it via device properties.
1.363	25-Mar-2021	rin	branches: 1.363.2; Introduce COM_HW_BROKEN_ETXRDY bit in sc_hwflags; push TX queue if possible in comintr() even if IIR_NOPEND is asserted. Combined with sc_poll_ticks, this flag works around HW bug, by which ETXRDY interrupts are (sometimes) lost.
1.362	25-Mar-2021	rin	Introduce sc_poll_ticks and obsolete COM_HW_POLL bit in sc_hwflags. Polling is scheduled at every sc_poll_ticks ticks. This is useful to work around H/W bug, by which interrupts are lost sometimes; interrupt-based I/O mostly works and no need for polling every counter ticks.
1.361	30-Sep-2020	jmcneill	branches: 1.361.2; 1.361.4; Set sc_fifolen=1 for the no fifo case
1.360	28-Sep-2020	jmcneill	Auto-detect DW APB UART FIFO length and print the FIFO length when enabled instead of just "working fifo".
1.359	26-May-2020	martin	Make the readahead-while-sending-output code conditional in com_common_putc(), only erquest readahead before interrupts are enabled and when called from comcnputc(). Fixes PR kern/55286.
1.358	01-May-2020	simonb	Get rid of needless __predict_true() and move a comment slightly.
1.357	01-Feb-2020	skrll	Use designated initializers
1.356	10-Nov-2019	chs	branches: 1.356.2; in many device attach paths, allocate memory with M_WAITOK instead of M_NOWAIT and remove code to handle failures that can no longer happen.
1.355	11-Jan-2019	thorpej	Simplify regmap initialization, and fix an regmap issue that affected TI OMAP (LCR register would get clobbered due to using the wrong offset for the MDR1 register) reported by Lwazi Dube (who also found the root cause).
1.354	11-Dec-2018	thorpej	Add a convenience function, com_init_regs_stride(), that shifts the register offsets and size by the specified amount. Use in front-ends as appropriate.
1.353	09-Dec-2018	thorpej	sparc64 doesn't have a scalar bus_space_handle_t, so cope with this. Also, add a comment about why we're using the dummy / nil space handle in the first place.
1.352	08-Dec-2018	thorpej	Remove the COM_REGMAP option -- just use it all the time. While here, garbage-collect the COM_FUNCMAP and COM_AU1X00 options, as there are not used anywhere.
1.351	08-Dec-2018	thorpej	Clean up initialization of com_regs structure, in preparation for some additional changers.
1.350	30-Nov-2018	jmcneill	Add support for com(4) without an interrupt by setting the COM_HW_POLL flag
1.349	28-Nov-2018	jmcneill	Add support for a "force_console" property, where when set, reuses the console dev configuration
1.348	27-May-2018	jmcneill	branches: 1.348.2; Rename COM_TYPE_SUNXI -> COM_TYPE_DW_APB
1.347	08-Apr-2018	jmcneill	Remove COM_AWIN option
1.346	04-Dec-2017	bouyer	branches: 1.346.2; Put back SUNXI definitions in the COM_REGMAP case; com.c uses them without #ifdef COM_AWIN. To be safe, expand the register map to 42 entries.
1.345	31-Oct-2017	martin	As discussed on tech-kern: define a new tty internal state flag: TS_KERN_ONLY Implement it in a few tty drivers. If this flag is set, the underlying hardware is used by another driver and userland has no right to open it. A few uses will appear soon in sys/dev/sun/sun{kbd,ms}.c.
1.344	29-Oct-2017	jmcneill	Make all of the COM_xxx type options runtime selectable. Kernel configs with the existing options (COM_16650, COM_16750, COM_AWIN, COM_HAYESP, and COM_PXA2X0) will select the correct type in com_attach_subr. New code should specify the com type by passing COM_TYPE_xxx to comcnattach and/or setting sc_type.
1.343	28-Oct-2017	riastradh	Kill some more extern struct cfdriver declarations. Down with externs in .c!
1.342	10-Aug-2017	nat	Report AUXUART fifo size on rpi3 to 1 byte. This prevents bluetooth errors using the h5 protocol.
1.341	31-Jul-2017	jmcneill	Broadcom AUX UART doesn't seem to set LSR RXRDY bit when data is available in the RX FIFO.
1.340	31-Jul-2017	jmcneill	Add COM_TYPE_BCMAUXUART type for BCM2835 AUX UART.
1.339	27-May-2016	bouyer	branches: 1.339.10; The UART in the allwiner SoCs is not full-compatible with the 16550, and it's not a 16750 either. Like the 16750 it has the IIR_BUSY interrupt, which is triggered when writing to LCR while the chip can't accept it. But unlike the 16750, it has a specific register, HALT, to allow writing to the LCR and divisor registers, and then commit the changes. Tested on an A20 SoC, changing the baud rate while keeping the tty device open and incoming data.
1.338	14-Dec-2015	jmcneill	Fix TX FIFO on Tegra
1.337	02-Nov-2015	christos	PR/50395: Vicente Chaves de Melo: Loss of characters in serial port communication between gdb and kgdb_stub: switch to line break interrupt both when entering KGDB and also on shutdown so we can re-enter the debugger with BREAK.
1.336	04-May-2015	jmcneill	For Tegra K1, set IE_RX_TIMEOUT (bit 4) in IER register. RX_TIMEOUT occurs when data has been sitting in the Rx FIFO for more than 4 character times without being read because there is not enough data to reach the trigger level. With this change, enable FIFO usage for Tegra UARTs.
1.335	04-May-2015	macallan	fix pasto, use SET() and CLR() thanks jmcneill@
1.334	03-May-2015	jmcneill	add COM_TYPE_TEGRA
1.333	13-Apr-2015	riastradh	Convert sys/dev to use <sys/rndsource.h>.
1.332	07-Mar-2015	skrll	KNF
1.331	07-Mar-2015	skrll	Fix build. Hi mipsallan
1.330	07-Mar-2015	macallan	more Ingenic support: - make sure we always set FIFO_UART_ON - deal with the absence of DCD support - enable the TX FIFO timeout interrupt - set COM_HW_NOIEN - pretend the FIFO is only 16 bytes deep ( supposed to be 64 but I get overruns with that ) now this works as CI20 console
1.329	22-Nov-2014	macallan	branches: 1.329.2; deal with quirk in Ingenic UARTs ( they have a bit in the FIFO control register which turns the entire port off if not set )
1.328	15-Nov-2014	christos	centralize the dialout/call unit macros.
1.327	10-Aug-2014	tls	branches: 1.327.2; Merge tls-earlyentropy branch into HEAD.
1.326	25-Jul-2014	dholland	Add d_discard to all struct cdevsw instances I could find. All have been set to "nodiscard"; some should get a real implementation.
1.325	08-Apr-2014	christos	Clear dtr on transition from !0 to 0, and set it on the opposite. This leaves dtr alone in the normal case.
1.324	06-Apr-2014	christos	PR/48720: John Kelly: com driver does not allow B0 to be set. The code to handle B0 was commented out for no reason given at revision 1.99. POSIX mandates to hangup on B0: http://pubs.opengroup.org/onlinepubs/9699919799/functions/tcsetattr.html
1.323	16-Mar-2014	dholland	branches: 1.323.2; Change (mostly mechanically) every cdevsw/bdevsw I can find to use designated initializers. I have not built every extant kernel so I have probably broken at least one build; however I've also found and fixed some wrong cdevsw/bdevsw entries so even if so I think we come out ahead.
1.322	22-Dec-2013	matt	Now that cngetc supports -1 as a return value from the cn_getc routine, let cngetc loop until a character is available so it can call the critpoll hooks.
1.321	16-Dec-2013	skrll	Use #if defined in previous.
1.320	16-Dec-2013	htodd	Fix build.
1.319	15-Dec-2013	mbalmer	lcr is only used when COM_16650 is defined; unbreak the build
1.318	15-Dec-2013	skrll	Only attempt to set 64byte fifo for 16750 when COM_16750 is defined. Hi kiyohara. PR/48359 NetBSD/cobalt 6.99.25 GENERIC kernel freeze at initializing com0
1.317	03-Oct-2013	kiyohara	Revirt 'Move the Marvell extension to com_mv.c' at Sun Sep 1 04:51:24 UTC 2013. build test only.
1.316	12-Sep-2013	martin	Minor tweaks for newer gcc
1.315	03-Sep-2013	jmcneill	no EFR on tl16c750, use AFE bit on MCR reg instead for flow control
1.314	01-Sep-2013	kiyohara	Add support 16750 64Byte FIFO. But not test.
1.313	01-Sep-2013	kiyohara	Move the Marvell extension to com_mv.c.
1.312	27-Jul-2013	kiyohara	As for the console of ns16750, comintr() may be called before comopen(). If sc_lcr is not initialized at this time, console will be in an ugly state.
1.311	27-Jul-2013	kiyohara	Remove white-spaces, null-line and new-line.
1.310	01-May-2013	mlelstv	branches: 1.310.4; For a polled console incoming characters are buffered on output. The buffer is never passed to the regular tty routines and can survive from early boot to halt where it is read by the "press any continue to reboot" loops. As a workaround, just kill the read-ahead buffer when switching from and to polled mode.
1.309	20-Apr-2013	rkujawa	Add support for 16750 style UARTs. Activated by defining COM_16750. Obtained from Marvell, Semihalf.
1.308	24-Feb-2013	matt	Initialize t_softc.
1.307	10-Jan-2013	macallan	don't try to become console if we get is_console=false as device property
1.306	21-May-2012	skrll	branches: 1.306.2; Remove empty line.
1.305	22-Apr-2012	christos	don't include <sys/rnd.h> before we define cn_trap, because it might bring in <sys/systm.h>
1.304	02-Feb-2012	tls	branches: 1.304.2; Entropy-pool implementation move and cleanup. 1) Move core entropy-pool code and source/sink/sample management code to sys/kern from sys/dev. 2) Remove use of NRND as test for presence of entropy-pool code throughout source tree. 3) Remove use of RND_ENABLED in device drivers as microoptimization to avoid expensive operations on disabled entropy sources; make the rnd_add calls do this directly so all callers benefit. 4) Fix bug in recent rnd_add_data()/rnd_add_uint32() changes that might have lead to slight entropy overestimation for some sources. 5) Add new source types for environmental sensors, power sensors, VM system events, and skew between clocks, with a sample implementation for each. ok releng to go in before the branch due to the difficulty of later pullup (widespread #ifdef removal and moved files). Tested with release builds on amd64 and evbarm and live testing on amd64.
1.303	27-Nov-2011	jakllsch	branches: 1.303.2; more whitespace and comment spelling fixes
1.302	27-Nov-2011	jakllsch	whitespace consistency adjustment
1.301	28-May-2011	matt	branches: 1.301.4; Allow COM_TOLERANCE to be tweakable. If comspeed returns an invalid rate, don't use that error value to set the speed.
1.300	24-Apr-2011	rmind	Rename ttymalloc() to tty_alloc(), and ttyfree() to tty_free() for consistency. Remove some unnecessary malloc.h inclusions as well.
1.299	22-Jan-2011	tsutsui	Revert part of changes in rev 1.298: - it breaks cobalt's serial console as mentioned in PR port-cobalt/44292 - MCR_PRESCALE doesn't affect unless EFR_EFCR is set in the EFR register - even if MCR_PRESCALE is enabled we should define appropriate sc_type variants and BRG values should be adjusted in comspeed() per sc_type - sc_frequency should be adjusted in MD attachment if necessary Tested on cobalt by several people, ok from jklos@
1.298	20-Jul-2010	jklos	branches: 1.298.2; 1.298.4; Add support for 16650's prescaler from Frank Wille. Tested with IOblix on Amiga.
1.297	19-Apr-2010	dyoung	Add default implementations for bus_space_is_equal(9), bus_space_tag_create(9), and bus_space_tag_destroy(9). Use bus_space_is_equal(9) throughout the kernel to compare bus_space_tag_t's. Tested on i386 and on sparc64.
1.296	22-Mar-2010	dyoung	MI code should not compare bus_space_tag_t! Introduce tags_are_equal() for "comparing" two bus_space_tag_t's. It is always true. Everywhere that com(4) compares two tags, it compares to I/O base addresses, too; comparing the base addresses should suffice. TBD Clean this up more thoroughly.
1.295	24-Feb-2010	dyoung	branches: 1.295.2; A pointer typedef entails trading too much flexibility to declare const and non-const types, and the kernel uses both const and non-const PMF qualifiers and device suspensors, so change the pmf_qual_t and device_suspensor_t typedefs from "pointers to const" to non-pointer, non-const types.
1.294	09-Jan-2010	tsutsui	branches: 1.294.2; To print bus_addr_t value, cast it to u_long rather than size_t.
1.293	08-Jan-2010	dyoung	Expand PMF_FN_* macros.
1.292	06-Dec-2009	dyoung	Delete dead code.
1.291	23-Nov-2009	rmind	Remove some unecessary includes sys/user.h header.
1.290	12-Nov-2009	dyoung	Remove some dead code.
1.289	12-Nov-2009	dyoung	Move the code in com_activate() to com_detach(), where it always belonged. Remove com_activate(). Consolidate information about the console on com(4) in a new struct comcons_info. Support detachment & re-attachment of a system console on com(4). Re-attachment is somehow incomplete. Ideally, if some other device could take over as console, it would, but we're not quite there, yet.
1.288	06-May-2009	cegger	add KASSERT to identify when PR kern/40734 happens again. It happened to me twice and to Emmanuel Dreyfus (reported on port-amd64 ML)
1.287	03-Jan-2009	yamt	branches: 1.287.2; remove extra semicolons.
1.286	25-Oct-2008	matt	branches: 1.286.2; 1.286.10; 1.286.14; Simplify NOERS case. Revert most changes back to 1.283.
1.285	25-Oct-2008	tsutsui	Fix a botch in an FIFO check for 16650.
1.284	25-Oct-2008	he	Replace a "type" with "sc->sc_type" to make this build again for cobalt (and I'm sure a few others as well).
1.283	24-Oct-2008	matt	Add support for 16550 chips without an Enhanced Register Set.
1.282	14-Jul-2008	matt	Remove OMAP gunk in com_activate, it's not needed. Spotted by Matthias Drochner.
1.281	28-Apr-2008	matt	branches: 1.281.2; 1.281.4; 1.281.6; More forgotten changes from matt-armv6.
1.280	28-Apr-2008	martin	Remove clause 3 and 4 from TNF licenses
1.279	21-Apr-2008	ad	branches: 1.279.2; Make ntp, pmc, reboot, sysarch, time syscalls MPSAFE.
1.278	11-Apr-2008	tsutsui	branches: 1.278.2; If it's a high speed, trim the trigger level down to prevent overflows, as comment says. The piece of code was removed in rev 1.230, but it looks an error on reverting of rev 1.228.
1.277	14-Mar-2008	cube	Fix compilation under options RND_COM and COM_DEBUG. Reported by Kurt Schreiner on current-users@.
1.276	14-Mar-2008	cube	Split device_t and softc for all com(4) devices (well, everything that uses a com_softc backend). Use proper types and ansify where appropriate.
1.275	07-Mar-2008	dyoung	In com_detach(), don't destroy the lock twice.
1.274	07-Mar-2008	dyoung	Use device_t and its accessors.
1.273	29-Feb-2008	dyoung	Use pmf_device_register1() instead of shutdownhook_establish() to register com_cleanup() as the shutdown hook. Add a generic suspend routine. Suspend and resume com@isa. Protect against dereferencing a NULL softc in comioctl(). Destroy both a mutex and a callout in com_detach(). Cosmetic: use aprint_*_dev(). Use PMF_FN_ARGS, PMF_FN_PROTO.
1.272	28-Jan-2008	dyoung	branches: 1.272.2; 1.272.6; Do not allow the system console to detach, because that will lead to a panic.
1.271	24-Jan-2008	ad	Destroy mutex when detaching. PR kern/37819.
1.270	20-Jan-2008	joerg	Now that __HAVE_TIMECOUNTER and __HAVE_GENERIC_TODR are invariants, remove the conditionals and the code associated with the undef case.
1.269	05-Jan-2008	ad	Work around com hangs with pcmcia. PR kern/37462.
1.268	14-Dec-2007	dyoung	Add a resume handler for com@isa, using Jared McNeill's suggested code from current-users. com@acpi, et cetera, remain to be done.
1.267	05-Dec-2007	ad	branches: 1.267.4; Match the docs: MUTEX_DRIVER/SPIN are now only for porting code written for Solaris.
1.266	19-Nov-2007	ad	branches: 1.266.2; - Factor out too many copies of the same bit of tty code. - Fix another tty signalling/wakeup problem.
1.265	19-Oct-2007	ad	branches: 1.265.2; machine/{bus,cpu,intr}.h -> sys/{bus,cpu,intr}.h
1.264	17-Oct-2007	ad	branches: 1.264.2; Reapply rev 1.262 and add a comment about it.
1.263	08-Oct-2007	ad	Merge from vmlocking: use mutexes and the softint API.
1.262	16-Aug-2007	martin	branches: 1.262.2; 1.262.4; Remove all locking from com_enable_debugport() - it is either called at attach time, where we don't need further locking, or from comopen(), where the caller does proper locking already.
1.261	14-Jul-2007	ad	branches: 1.261.2; 1.261.6; Generic soft interrupts are mandatory.
1.260	09-Jul-2007	ad	Merge some of the less invasive changes from the vmlocking branch: - kthread, callout, devsw API changes - select()/poll() improvements - miscellaneous MT safety improvements
1.259	04-Mar-2007	christos	branches: 1.259.2; 1.259.4; Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.
1.258	10-Jan-2007	cube	branches: 1.258.2; Make COM_HAYESP compile again. It assumes no register mapping is needed.
1.257	10-Dec-2006	uwe	aprint_naive("\n") to terminate "Found" line for quiet boot. Use aprint_error to report that we are unable to establish power hook.
1.256	16-Nov-2006	christos	__unused removal on arguments; approved by core.
1.255	12-Oct-2006	christos	- sprinkle __unused on function decls. - fix a couple of unused bugs - no more -Wno-unused for i386
1.254	01-Oct-2006	elad	More from Matt Fleming: Adapt to KAUTH_DEVICE_TTY_PRIVSET and KAUTH_DEVICE_TTY_OPEN.
1.253	01-Oct-2006	elad	Adapt MD code to KAUTH_DEVICE_TTY_OPEN, batch #2 from Matt Fleming, thanks! Also, add forgotten splx() calls in some places.
1.252	24-Sep-2006	jmcneill	Add "name" parameter to powerhook_establish, to aid debugging. No objections on tech-kern@
1.251	08-Aug-2006	mrg	branches: 1.251.2; 1.251.4; fix a GCC uninitialised variable warning only seen at -O3.
1.250	22-Jul-2006	elad	branches: 1.250.2; oops, no 'p' here. from xtraeme@.
1.249	22-Jul-2006	elad	don't call kauth_authorize_generic() when holding a lock, from yamt@.
1.248	21-Jul-2006	ad	- Use the LWP cached credentials where sane. - Minor cosmetic changes.
1.247	13-Jul-2006	gdamore	Add an option COM_REGMAP to allow com(4) to use an array of register indices. This allows us to convert aucom to just another com attachment, and cleanup some code in the com_arbus.c. Additionally, we use a common com_cleanup routine rather than having a zillion copies of it in the attachment points. This has been tested on a number architectures, and it has been shown to get close to comparable performance when COM_REGMAP is defined, and comparable when it is not defined. Approved by core@. Fixes PR port-evbmips/32362.
1.246	25-Jun-2006	jmcneill	Make sure that a powerhook was successfully established before trying to disestablish it on detach.
1.245	25-Jun-2006	perry	Add a power hook for the com device.
1.244	07-Jun-2006	kardel	branches: 1.244.2; merge FreeBSD timecounters from branch simonb-timecounters - struct timeval time is gone time.tv_sec -> time_second - struct timeval mono_time is gone mono_time.tv_sec -> time_uptime - access to time via {get,}{micro,nano,bin}time() get* versions are fast but less precise - support NTP nanokernel implementation (NTP API 4) - further reading: Timecounter Paper: http://phk.freebsd.dk/pubs/timecounter.pdf NTP Nanokernel: http://www.eecis.udel.edu/~mills/ntp/html/kern.html
1.243	14-May-2006	elad	branches: 1.243.2; integrate kauth.
1.242	28-Mar-2006	thorpej	Use device_unit().
1.241	20-Feb-2006	thorpej	branches: 1.241.2; 1.241.4; 1.241.6; Use device_is_active() rather than testing dv_flags for DVF_ACTIVE directly.
1.240	08-Jan-2006	dsl	branches: 1.240.2; 1.240.4; Save console baud rate as both the input and output rates. This is what I thought I'd done in rev 1.237
1.239	27-Dec-2005	chs	branches: 1.239.2; remove the COM_MPLOCK option. always include the spinlock in the softc and always call the simple_* locking functions. the locking functions are compiled out if they are not needed anyway, so a separate option for this doesn't gain anything. this also fixes the serial console on my alpha ES40 (which doesn't make much sense since the com driver should still be under the big lock on alpha, but whatever).
1.238	11-Dec-2005	christos	merge ktrace-lwp.
1.237	06-Nov-2005	dsl	Explicitly default the input baud rate (c_ispeed) to the output baud rate (c_ospeed) instead of setting it to zero. Otherwise nothing ever sets it unless some code explicitly changes the baud rate. For a serial console (in particular) we want to use the baud rate set by the bios (or whatever) and used by theboot code. This is the way it was before a 'new version of com driver' was added in 1997 (rev 1.99)
1.236	06-Sep-2005	kleink	Change the driver open function's conditional for overriding exclusive tty use from checking the proc's uid to suser(9), and account for the use of privileges. Noted by David Holland in PR kern/31126.
1.235	04-Sep-2005	kleink	Make COM_DEBUG compile again in the wake of -Wwrite-strings; from Nicolas Joly in PR kern/31141.
1.234	21-Jun-2005	ws	branches: 1.234.2; PR-30566: Poll must not return <sys/errno.h> values. Start with those places I can easily test.
1.233	12-Jun-2005	tls	Revert the part of revision 1.228 that made HW_NO_TXPRELOAD the default: it appears to break output on the Soekris net4501, which is a rather popular platform. This should fix PR kern/29612 -- if not, I will probably revert it again.
1.232	27-Feb-2005	perry	branches: 1.232.2; nuke trailing whitespace
1.231	09-Aug-2004	mycroft	branches: 1.231.4; 1.231.6; Do an extra read of the IIR during initialization, just to ack any pending interrupt.
1.230	04-Jul-2004	mycroft	Back off the trigger level a little. Testing shows that it's not terribly reliable at 14.
1.229	04-Jul-2004	mycroft	Minor simplification.
1.228	04-Jul-2004	mycroft	Incorporate 4 changes that have been suggested: * At high speed, set the FIFO trigger to the maximum value to reduce interrupt load. PR 15448. * Handler the case of IIR=RXRDY and LSR=!LSR_RCV_MASK differently, to avoid a hang with some chips. PR 21184, and possibly PR 10974 and PR 8248. * Remove the extra wait at the end of com_common_putc(), after writing a character out, so that we get another TXRDY interrupt. This prevents stalls when normal output and kernel output are mixed. PR 4263. * Do not "preload" the TX FIFO; wait for a TXRDY interrupt to come in after enabling it.
1.227	01-May-2004	thorpej	Rename the COM16650 option to COM_16650, for consistency with other com variant options.
1.226	01-May-2004	thorpej	Wait just a little longer for console output to finish when we're attaching the console uart.
1.225	05-Apr-2004	enami	Fix race condition introduced in rev 1.189; after the change, if there is THRE interrupt occurs between the LSR read and IIR read, we won't see the LSR_TXRDY bit when testing it in the variable `lsr' and we don't interrupted again (as the corresponding bit in the IIR is cleared by reading, except for some broken device). Tested by Matthias Scheler and me, reviewed by Allen Briggs. Closes PR#25010.
1.224	23-Jan-2004	simonb	branches: 1.224.2; Fix NTP PPSAPI support (enabled with "options PPS_SYNC"): From PR kern/13702 from Charles Carvalho. Tested on alpha and i386 with a Laipac TF10 PPS-capable GPS. The com.c change was copied wholesale from Charles' z8530tty.c patch.
1.223	12-Nov-2003	simonb	Use just "type" and not "sc->sc_type" in cominit(). Pointed out by Shoichi Miyake in private mail.
1.222	08-Nov-2003	simonb	Make comsoft_callout static; it's not referenced outside this file.
1.221	06-Nov-2003	simonb	Be consistent with other COM_TYPE_PXA2x0 checks.
1.220	06-Nov-2003	simonb	White space nit.
1.219	03-Sep-2003	simonb	Add missing semicolon.
1.218	01-Sep-2003	christos	fix debugging printfs
1.217	07-Aug-2003	agc	Move UCB-licensed code from 4-clause to 3-clause licence. Patches provided by Joel Baker in PR 22364, verified by myself.
1.216	29-Jun-2003	fvdl	branches: 1.216.2; Back out the lwp/ktrace changes. They contained a lot of colateral damage, and need to be examined and discussed more.
1.215	29-Jun-2003	simonb	Restore parentheses around return value that were removed with the previous commit.
1.214	28-Jun-2003	darrenr	Pass lwp pointers throughtout the kernel, as required, so that the lwpid can be inserted into ktrace records. The general change has been to replace "struct proc " with "struct lwp " in various function prototypes, pass the lwp through and use l_proc to get the process pointer when needed. Bump the kernel rev up to 1.6V
1.213	23-Jun-2003	martin	Make sure to include opt_foo.h if a defflag option FOO is used.
1.212	18-Jun-2003	bsh	in cominit(), turn on UUE bit in IER register if it is PXA2x0's built-in UART.
1.211	15-Jun-2003	simonb	Wrap some long lines.
1.210	14-Jun-2003	thorpej	Also pass a type argument to comcnattach() and com_kgdb_attach(). comspeed() (and thus cominit()) may need this information.
1.209	14-Jun-2003	thorpej	Introduce a new "type" field in the softc which is used to indicate the general UART type. Currently, we have "normal", "hayesp" and "pxa2x0" types. Replace the corresponding hw flags with the new type values.
1.208	05-Jun-2003	scw	Add support, via a kernel config file option, for the 16550-compatible com ports found on Intel PXA2x0 processors. Re-arrange the code which detects the FIFO configuration to defer printing until _after_ com_fifo is cleared. Some supposedly compatible chips clear the Tx/Rx FIFOs when this happens, resulting in previous output being lost.
1.207	18-May-2003	fvdl	Inialize sc_tty->t_dev early for serial console, so that cn_check_magic will match in the case of a break before the console was opened for the first time. Makes BREAKing into DDB work (again) as soon as interrupts are enabled.
1.206	28-Apr-2003	briggs	Allow the console to be used for kgdb if both DDB and KGDB are defined.
1.205	21-Apr-2003	gson	Ignore input when the port is not open. This change is functionally identical to the patch in kern/6502 (which is hereby fixed), but modelled after the corresponding fix to the 8530 driver in z8530tty.c revision 1.60 to maintain consistency with that driver.
1.204	14-Mar-2003	simonb	Fix some white-space niggles.
1.203	06-Mar-2003	matt	Add cn_halt and cn_flush entries to consdevs. (needed for dma-only console devices).
1.202	31-Jan-2003	thorpej	Use aprint_*().
1.201	07-Nov-2002	thorpej	Fix signed/unsigned comparison warnings.
1.200	23-Oct-2002	jdolecek	merge kqueue branch into -current kqueue provides a stateful and efficient event notification framework currently supported events include socket, file, directory, fifo, pipe, tty and device changes, and monitoring of processes and signals kqueue is supported by all writable filesystems in NetBSD tree (with exception of Coda) and all device drivers supporting poll(2) based on work done by Jonathan Lemon for FreeBSD initial NetBSD port done by Luke Mewburn and Jason Thorpe
1.199	06-Sep-2002	gehenna	Merge the gehenna-devsw branch into the trunk. This merge changes the device switch tables from static array to dynamically generated by config(8). - All device switches is defined as a constant structure in device drivers. - The new grammer ``device-major'' is introduced to ``files''. device-major <prefix> char <num> [block <num>] [<rules>] - All device major numbers must be listed up in port dependent majors.<arch> by using this grammer. - Added the new naming convention. The name of the device switch must be <prefix>_[bc]devsw for auto-generation of device switch tables. - The backward compatibility of loading block/character device switch by LKM framework is broken. This is necessary to convert from block/character device major to device name in runtime and vice versa. - The restriction to assign device major by LKM is completely removed. We don't need to reserve LKM entries for dynamic loading of device switch. - In compile time, device major numbers list is packed into the kernel and the LKM framework will refer it to assign device major number dynamically.
1.198	29-Jul-2002	simonb	Don't name parameters in a function declaration.
1.197	29-Jul-2002	simonb	ANSIfy, KNF.
1.196	13-Apr-2002	christos	branches: 1.196.2; 1.196.4; PR/16058: Tero Kivinen: Don't free rbuf or detach tty if rbuf allocation failed during attach phase.
1.195	12-Apr-2002	thorpej	* Add a new hwflag, COM_HW_NO_TXPRELOAD, which tells comstart() to not pre-load the chip's Tx buffer, but instead waits for the Tx Ready interrupt to transmit the first chunk of data. * On the IOP310, set COM_HW_NO_TXPRELOAD, rather than COM_HW_TXFIFO_DISABLE. This solves the "UART hangs" problem on the Npwr in a nicer way (i.e. we get to use the FIFO, whee). The COM_HW_NO_TXPRELOAD happens to match the Linux 16550 driver's Tx algorithm, and the "UART hang" was never observed on the Npwr running Linux. Eventually, we might want to eliminate the COM_HW_NO_TXPRELOAD, and simply always use its algorithm. But it should be tested on more 16x50 variants before we do that. Kudos to Valeriy Ushakov <uwe@netbsd.org> for pointing out this solution (which also happens to fix the stray UART interrupt issue on the Krups Javastation), and to Allen Briggs <briggs@netbsd.org> for experimenting with various methods of fixing this.
1.194	17-Mar-2002	atatat	Convert ioctl code to use EPASSTHROUGH instead of -1 or ENOTTY for indicating an unhandled "command". ERESTART is -1, which can lead to confusion. ERESTART has been moved to -3 and EPASSTHROUGH has been placed at -4. No ioctl code should now return -1 anywhere. The ioctl() system call is now properly restartable.
1.193	20-Nov-2001	lukem	- pull in opt_kgdb.h where necessary - replace opt_kgdb_machdep.h with opt_kgdb.h - defparam opt_kgdb.h: KGDB_DEV KGDB_DEVNAME KGDB_DEVADDR KGDB_DEVRATE KGDB_DEVMODE - move from opt_ddbparam.h to opt_ddb.h: DDB_FROMCONSOLE DDB_ONPANIC DDB_HISTORY_SIZE DDB_BREAK_CHAR SYMTAB_SPACE - replace KGDBDEV with KGDB_DEV - replace KGDBADDR with KGDB_DEVADDR - replace KGDBMODE with KGDB_DEVMODE - replace KGDBRATE with KGDB_DEVRATE - use `9600' instead of `0x2580' for 9600 baud rate - use correct quotes for options KGDB_DEVNAME="\"com\"" - use correct quotes for options KGDB_DEV="17*256+0" - remove unnecessary dependancy on Makefile for kgdb_stub.o - minor whitespace cleanup
1.192	15-Nov-2001	lukem	don't need <sys/types.h> when including <sys/param.h>
1.191	13-Nov-2001	lukem	add/cleanup RCSID
1.190	05-Nov-2001	fvdl	Initialize the cn_magic goo for kgdb (bah, that should really not be necessary).
1.189	17-Sep-2001	briggs	branches: 1.189.2; Patch to handle odd behavior from exar ST16C1550 UART. It does not set IIR_NOPEND if the TXRDY condition is true. Apparently, other chips do not take TXRDY into account in the IIR_NOPEND case. Also remove useless assignment (iir = IIR_NOPEND;) in one case. No response from patch posted on tech-kern 29Aug2001.
1.188	27-Aug-2001	enami	branches: 1.188.2; For hayes esp card, set prescaler if specified rate is grater than 115200.
1.187	22-Aug-2001	simonb	Cosmetic cleanups: - cominit() is local to com.c, remove prototype from comvar.h. - Don't prototype comstop(), cdev_decl(com) does this. - Don't use a block device switch table declaration(!). - No need to include "com.h".
1.186	20-Jun-2001	uwe	branches: 1.186.2; Convert to use cnmagic(9). Unifdef DDB and DDB_BREAK_CHAR. While I'm here, s/ungetc/readahead/ in com_common_* because that's what it _really_ is, "ungetc" is a very confusing name.
1.185	30-May-2001	lukem	add missing #include "opt_kgdb.h"
1.184	02-May-2001	scw	Add `l_poll' to `struct linesw' and provide an xxxpoll() entry point in each tty driver to indirect through it. This allows tty line-disciplines to handle poll(2) system calls.
1.183	14-Jan-2001	thorpej	branches: 1.183.2; Rename __GENERIC_SOFT_INTERRUPTS to __HAVE_GENERIC_SOFT_INTERRUPTS, and place the definition in <machine/types.h>. This can now be used as a flag to indicate whether or not <machine/intr.h> can be included to get the generic soft interrupt API.
1.182	18-Nov-2000	sommerfeld	Initialize ring buffer pointers when the ring buffer is allocated. (comsoft() can be invoked before comopen() on serial consoles; a character received before the console is opened "for real" can result in a fatal trap unless the ring buffer pointers are initialized early)
1.181	01-Nov-2000	eeh	Adapt to the new line discipline scheme.
1.180	26-Sep-2000	sommerfeld	Add missing '&& defined(COM_MPLOCK)'
1.179	23-Sep-2000	sommerfeld	Add `COM_MPLOCK' option to use a device-instance-specific spinlocks when running at splserial(). This is a temporary measure (until there's a MP-safe interrupt handling structure); until then, it should be used when MULTIPROCESSOR and IPL_SERIAL > IPL_SCHED.
1.178	22-Sep-2000	eeh	paddr_t -> bus_addr_t.
1.177	21-Sep-2000	eeh	Support for SPARC machines with `su' devices.
1.176	17-Sep-2000	toshii	Change tiocm_to_{com,zs}'s second argument to u_long to match with the type in their caller.
1.175	18-Aug-2000	sommerfeld	Avoid calling tsleep when running above splhigh()
1.174	03-Aug-2000	jeffs	Add options DDB_BREAK_CHAR. This overrides break on the serial console break character with the supplied one. This is useful for cases where break is hard to generate, or you are connected to a PC that "sends" breaks when power cycled. For this mode in com, interpret break char in the polling section, which allows entry into the debugger before the tty is opened. Only supported in the com driver currently.
1.173	06-Jul-2000	thorpej	Use device_lookup().
1.172	03-May-2000	thorpej	Remove unnecessary junk on #undef line that some C preprocessors get cranky about.
1.171	30-Mar-2000	simonb	Delete redundant decl of com_attach_subr(), it's in comvar.h.
1.170	23-Mar-2000	thorpej	New callout mechanism with two major improvements over the old timeout()/untimeout() API: - Clients supply callout handle storage, thus eliminating problems of resource allocation. - Insertion and removal of callouts is constant time, important as this facility is used quite a lot in the kernel. The old timeout()/untimeout() API has been removed from the kernel.
1.169	06-Mar-2000	thorpej	- Implement cnbell() -- ring the console bell. The cn_bell entrypoint is optional. - Add cn_bell to statically allocated consdevs as appropriate.
1.168	07-Feb-2000	jonathan	Fix thinko in previous revision: it wouldn't catch deassert. Revert the code inside the new test to the previous-but-one revision.
1.167	06-Feb-2000	jonathan	Check for DCD status change interrupts which signal PPS events, even if the line discipline is ignoring carrier (e.g., via comparam()'s setting of sc->sc_msr_mask). Move PPS timestamp outside the normal status-change processing, and ignore sc_msr_mask when testing for PPS events.
1.166	23-Jan-2000	soda	kluge to make this work with NEC M403 (arc/magnum).
1.165	21-Dec-1999	drochner	set carrier early if used as console or kgdb line, fixes PR kern/6547 by Andreas Gustafsson, gson@iengines.com
1.164	22-Nov-1999	sommerfeld	defopt COM_DEBUG, COM_HAYESP, and COM16650
1.163	04-Nov-1999	jonathan	Update user-level PPS-API to match -05 draft. Change PPS_<xxx> ioctls to PPS_IOC_<xxx>.
1.162	15-Oct-1999	jonathan	branches: 1.162.2; 1.162.4; Fix nanosecond/microsecond botch in PPSAPI: remove bogus TIMESPEC_TO_TIMEVAL() after applying any {assert,clear} offset.
1.161	19-Apr-1999	ross	branches: 1.161.2; Get rid of delay() in com_common_putc() because the Shark delay() is borked and can't be called until after the timers are setup. (It should not use a timer, or it should have a fallback algorithm.)
1.160	18-Apr-1999	thorpej	Revert revision 1.159. The correct answer was not to re-break the serial console support, but rather to fix the Shark delay().
1.159	31-Mar-1999	mrg	branches: 1.159.2; back date this file to version 1.155 which works on the shark.
1.158	29-Mar-1999	mycroft	Nuke bogus extra variable, too.
1.157	29-Mar-1999	mycroft	Fix bogons in previous change: * The fact that IIR_NOPEND was not set on entry does not mean that no transmission was in progress. Besides, we don't want to throw away receive interrupts either. * In the !clearirq case, we didn't splx().
1.156	29-Mar-1999	ross	Mods to com_common_putc(). When doing kprintf() or kgdb output: 1. don't clear the irq unless it was clear before transmitting 2. also do various bus_space_barrier() ops Stops console from freezing when kprintf interrupts tty driver output.
1.155	28-Feb-1999	explorer	Update to slightly altered rnd_attach_source() api
1.154	12-Feb-1999	drochner	make the probe stricter to catch cases where the chipset doesn't pull the data lines to "high" for not-existant devices
1.153	03-Feb-1999	mycroft	Separate the tiocm code into functions, like the z8530 code, and fix the same DTR bug.
1.152	03-Feb-1999	mycroft	Fix an inconsistency: PPS was turned off on first open, but the mode may have still claimed it was enabled.
1.151	03-Feb-1999	mycroft	Slight redux in PPS code.
1.150	26-Jan-1999	drochner	Debugger() -> console_debugger() to honour the ddb_fromconsole sysctl
1.149	18-Nov-1998	thorpej	Add support for detaching "com" instances.
1.148	16-Sep-1998	is	Garbage collect unused 3rd parameter to comprobe1().
1.147	09-Sep-1998	thorpej	Don't use M_WAITOK to allocate the ring buffer; we could be in interrupt context. Reported by Lennart Augustsson.
1.146	15-Aug-1998	mycroft	Assign my copyrights to TNF.
1.145	04-Jul-1998	jonathan	defopt DDB.
1.144	10-Jun-1998	jonathan	PPS support from April, reworked and extended to match the PPS-API Internet Draft (draft-mogul-pps-api-02.txt).
1.143	22-Mar-1998	mycroft	Move the code to wait for carrier on a tty into a common function, since it depends only on device-independent state bits. Implement SunOS-style `dialout' devices.
1.142	21-Mar-1998	mycroft	Remove a bogus initializer.
1.141	21-Mar-1998	mycroft	Replace TS_WOPEN with t_wopen, per mail on tech-kern.
1.140	25-Feb-1998	ross	Add dummy }} after comsoft() to keep ctags(1) bashing on.
1.139	22-Feb-1998	enami	Disable the device if we fail to open and nobody else has the device open. (Thanks Charles and Marc for your advices).
1.138	22-Feb-1998	mycroft	Fix bonehead error in previous change.
1.137	19-Feb-1998	mycroft	Remove stray label from last change.
1.136	19-Feb-1998	mycroft	Arrange to call com_break() and com_modem() at splserial(). It's simpler this way. Really.
1.135	09-Feb-1998	thorpej	Fix serial console support, which was broken by the previous revision: - In the console getc routine, block until a character becomes ready (no, really, we mean it). This routine should _never_ time out. - In the console putc routine, if the UART has trouble, do NOT proceed to print a diagnostic message, which would recursively invoke the console putc routine ad nauseum.
1.134	06-Feb-1998	enami	Restore system priority level before return from comopen().
1.133	02-Feb-1998	cgd	change #ifdefs keying on "alpha" to key on "__NO_SOFT_SERIAL_INTERRUPT" instead, and define that on NetBSD/alpha and NetBSD/arm32.
1.132	02-Feb-1998	cgd	Implement a flag to indicate that the driver attached correctly. This is useful in the case where an attachment's probe routine verifies that there is indeed hardware present but something goes "wrong" in the attach causing the device to be unusable. (Without keeping track of this, in that case incorrect ports could be accessed or uninitted pointers could be deferenced on open or at other times.)
1.131	01-Feb-1998	marc	split com_attach_subr into attach stuff and per-open initialization stuff add timeouts to all splserial() while loops so bugs elsewhere don't cause the com driver to wedge the machine add power management support
1.130	12-Jan-1998	thorpej	Adjust for config changes.
1.129	16-Dec-1997	mycroft	Don't do anything in comparam() if the line speed and flags are the same.
1.128	03-Nov-1997	mycroft	Slight optimization in soft input routine.
1.127	03-Nov-1997	mycroft	Mostly cosmetic and performance changes: * Make the ring buffer size and water marks patchable, and allocate the buffer separately. * Do the ttymalloc() at attach time. * Reorganize the receive buffer so the status and data pair are next to each other. This is slightly faster. * Make sure we actually do turn off interrupts in comclose() if we have DDB configured and it's not the console. (D'oh!!!!) * When we exhaust the current transmit run, turn off transmit interrupts in comintr(), so we're fairly sure we don't get another one. * Nuke the silly lsrmap[] idea; it's slower in the normal case. * Cache the l_rint pointer in the soft interrupt routine.
1.126	02-Nov-1997	mycroft	Slight code rearrangement.
1.125	02-Nov-1997	mycroft	Slight code rearrangement.
1.124	02-Nov-1997	mycroft	Rearrange *param() slightly to eliminate a spl. Also fix another comment regarding DTR.
1.123	02-Nov-1997	mycroft	Add another splserial()/splzs().
1.122	02-Nov-1997	mycroft	Minimize some spl regions slightly.
1.121	01-Nov-1997	mycroft	Correct a comment regarding our behaviour with DTR.
1.120	01-Nov-1997	mycroft	Add additional splserial()s in comopen() and comclose(). These are not necessary on the i386 port, but may be on others.
1.119	29-Oct-1997	drochner	Print probe result after the LCR is restored. Otherwise, bad things happen if we are the console. Restore to the prevoius value (not to hardwired 8N1) because this could be set by the serial console initialization. Closed PR kern/4373 (Dave Huang)
1.118	21-Oct-1997	fvdl	branches: 1.118.2; Make 16650 probe optional on COM16650 define. It breaks on some multiport Startech chips.
1.117	19-Oct-1997	mycroft	Initialize the IER to 0 in com_attach_subr().
1.116	19-Oct-1997	fvdl	Add 16650 hardware flowcontrol support. Basically PR 3844 from Dave Huang <khym@bga.com>, with added check for broken early versions of the 16650, taken from the Linux driver. This should be extended to use, for example, higher trigger levels for the bigger 16650 FIFO, and its capability for using a smaller divisor and thus higher speeds. But this patch is very useful for 16650 users already.
1.115	19-Oct-1997	explorer	Add hooks for entropy collection. Right now, you must place options RND_COM in your kernel config file (along with the pseudo-device rnd line) to enable this. If results are positive, I will make this enabled by default.
1.114	18-Oct-1997	is	Use long long in bitrate tolerance computation, else we'll overflow for higher than standard-pc chip clocks.
1.113	16-Oct-1997	thorpej	branches: 1.113.2; "com" driver files copied by repository copy magick to sys/dev/ic, and adjusted for their new home.
1.112	03-Oct-1997	mikel	fix missing com_kgdb_attached() argdecl, from Michael C. Richardson in PR 4196
1.111	30-Sep-1997	christos	Add TIOCM{BI{C,S},{S,G}ET} from revision 1.98. As Charles says these interfaces are slightly broken and should be obsoleted, but some programs are using them and also they are useful for debugging.
1.110	19-Sep-1997	enami	Cosmetic Changes; make coding style closer to other part of this file. (This version is identical with version 1.109 except whitespace changes.)
1.109	16-Sep-1997	is	Support for the upcoming NetBSD/Amiga Hypercom driver family: * support chip clocks != COM_FREQ, by introducing sc_frequency (for the mainline code) and adding a frequency parameter right after the rate parameter to comcnattach() and com_kgdb_attach(). - Make com_isa and com_multi initialize sc_frequency to COM_FREQ. - Make i386/machdep.c and alpha/dec_xxx.c call comattach() with the freq. parameter. supio_attach_args get two more fields: a sc_ipl and a sc_arg, both ints. - com_supio uses the first for interupt establishment (all childs will, as soon as they exist) and the 2nd for sc_frequency. - drsupio passes sc_ipl alway as 5, and for the "com"s, sc_arg as 16115200 - hyper will pass sc_ipl as 6, and sc_arg as 16 460800
1.108	27-Aug-1997	is	Make this work with __GENERIC_SOFT_INTERRUPTS.
1.107	24-Aug-1997	drochner	Check for KGDB port == console port in a consistent way.
1.106	23-Aug-1997	drochner	clean up the serial console / KGDB attachment: -put all early console / KGDB initialization into 1 exported function (com_*_attach()) each, dont use global variables anymore -use the passed tcflag_t for port settings instead of hardwiring 8N1 -at autoconfiguration attach time, decide if the attaching device is already console / KGDB by comparing bus tag and base addr (cgd's wish) -export a function "com_is_console()" for use by driver frontends for this comparision -delay setting of cn_tab->cn_dev until autoconfiguration attach to get the minor number right -delete unused comcnprobe() and comcninit()
1.105	16-Aug-1997	drochner	Bring back the "comconsattached" flag. It is necessary for starred com devices (on non "__BROKEN_INDIRECT_CONFIG" ISA).
1.104	14-Aug-1997	drochner	-Export variables needed for system console initialization. -Enable line break interrupt for DDB on a serial console. -Share initialization code between DDB and KGDB.
1.103	12-Aug-1997	drochner	KGDB improvements: -Separate KGDB port initialization and softc related stuff to allow KGDB to be attached in early system startup, before autoconfiguration. -Export the variables needed by md code to hand-craft bus tag/handle. -Fix initialization to enable interrupt by line break. -Call DDB/KGDB at line break (move DDB call from the softirq handler to the hard handler because it should work without a tty attached too).
1.102	05-Jul-1997	thorpej	branches: 1.102.2; Add support for remote serial KGDB.
1.101	15-Jun-1997	mycroft	Implement a better backpressure mechanism so that data is collected in the driver's buffer if the tty buffer is full. If the driver's buffer becomes full, turn off receive interrupts until it drains a bit.
1.100	26-May-1997	mycroft	Remove unneeded call to comstop() in commsrint(). This fixes a problem where the driver would sometimes retransmit bytes.
1.99	04-Apr-1997	mycroft	New version of com driver. Uses a different queueing mechanism and a split hardware/software interrupt mechanism for improved performance. Many odd protocols bugs also fixed.
1.98	04-Apr-1997	mycroft	comdefaultrate -> comconsrate comconsbah -> comconsioh Only use comconsrate on the console.
1.97	30-Jan-1997	cgd	don't clobber IER in cominit(). (suggested by mycroft.)
1.96	14-Dec-1996	mycroft	If attaching the console, reinitialize it immediately.
1.95	14-Dec-1996	mycroft	Turn off the baud rate changing optimization.
1.94	05-Dec-1996	cgd	update these so they compile whether or not __BROKEN_INDIRECT_CONFIG is defined.
1.93	13-Nov-1996	cgd	move cominit() prototype to comvar.h, so that ports which use 'com' for serial console, but don't use the (i386-specific) comcninit()/comcnprobe() functions, can do the right thing.
1.92	22-Oct-1996	cgd	add missing argument to bus_space_map in ESP code
1.91	21-Oct-1996	thorpej	New bus.h implementation/interface: - No more distinction between i/o-mapped and memory-mapped devices. It's all "bus space" now, and space tags differentiate the space with finer grain than the bus chipset tag. - Add memory barrier methods. - Implement space alloc/free methods. - Implement region read/write methods (like memcpy to/from bus space). This interface provides a better abstraction for dealing with machine-independent chipset drivers.
1.90	13-Oct-1996	christos	backout kprintf changes
1.89	10-Oct-1996	christos	printf -> kprintf, sprintf -> ksprintf
1.88	06-Oct-1996	mycroft	If we get a RXRDY interrupt, but RXRDY is not set in the LSR, briefly set IER to 0. This fixes a condition where some UARTs send an infinite stream of RXRDY interrupts.
1.87	06-Oct-1996	mycroft	Serial console changes: * Enable FIFO with trigger level 1. * Set DTR and RTS so terminals are happy.
1.86	05-Sep-1996	mycroft	compoll() -> comsoft()
1.85	02-Sep-1996	mycroft	tty stop functions really should return void, not int, and certainly not both.
1.84	10-Jul-1996	cgd	move DDB-only label inside an #ifdef, so that -Wall works
1.83	30-May-1996	cgd	add tty_attach() where appropriate.
1.82	12-May-1996	mycroft	branches: 1.82.4; Use intr.h.
1.81	05-May-1996	christos	Move comintr() prototype to comvar.h; needed by the multi-port cards.
1.80	29-Apr-1996	christos	- prototype fixes
1.79	15-Apr-1996	cgd	define and export the global variable "comconscflag", the default tty 'cflag' for the console. Normally set to TTYDEF_CFLAG, may be overridden by machine-dependent console attachment code, as necessary. (Alpha uses it to set cs8 -parenb.) Files including comvar.h now need to include <sys/termios.h>, because comconscflag is of type tcflag_t.
1.78	11-Apr-1996	cgd	update for addition of a machine-dependent cookie as the first argument to isa_intr_{,dis}establish().
1.77	17-Mar-1996	cgd	Add #ifdef's at the right places, on NCOM_ISA and NCOM_COMMULTI, to only include the relevant code in the probe & attach functions. Still one probe and one attach function, with #ifdefs, but this is a step in the right direction and saves a few hundred bytes (ooh, ahh!).
1.76	17-Mar-1996	thorpej	New device attachment scheme: - split softc size and match/attach out from cfdriver into a new struct cfattach. - new "attach" directive for files.*. May specify the name of the cfattach structure, so that devices may be easily attached to parents with different autoconfiguration semantics.
1.75	10-Mar-1996	cgd	convert these to use new <machine/bus.h> interfaces. This involved substantial reworking of the multi-port drivers, as they need to frob bits in the io-port spaces of their children. As a result, the commulti->com attachment interface is substantially more complex. (This may be fixable in the future by making some of the code common, but as long as io-port allocation checking is planned, it's necessary.)
1.74	09-Mar-1996	cgd	include comvar.h for comprobe1() prototype
1.73	26-Feb-1996	scottr	Fix typo (PR 2123, from Michael VanLoon)
1.72	20-Feb-1996	mycroft	Add more debugging code.
1.71	19-Feb-1996	mycroft	Update copyright notice.
1.70	19-Feb-1996	mycroft	Set IER_ETXRDY before outputting any bytes, to prevent race condition.
1.69	19-Feb-1996	mycroft	Handle break more correctly. Make IER_ETXRDY track TS_BUSY. (Prevents a loop in comintr() if no output is available.) Add a bunch of debugging code.
1.68	18-Feb-1996	mycroft	Fix a race condition where we might stop outputting if a write follows a flush too closely.
1.67	17-Feb-1996	mycroft	Add some text describing the UART lossage worked around in the previous.
1.66	17-Feb-1996	mycroft	Drain the transmitter FIFO before changing the baud rate or FIFO depth registers. Fixes PR 2046. Also, if COMCONSOLE is defined, expect CONSPEED to be the baud rate.
1.65	10-Feb-1996	christos	Hayes ESP patches [from PR database]
1.64	14-Jan-1996	christos	Hayes ESP support from Michael Van Loon, with minor cleanups. Tested on a single port ESP card; works great!
1.63	24-Dec-1995	mycroft	The IST_* and IPL_* constants are not bus-specific; don't treat them as such. Change splimp -> splnet in Ethernet, ARCnet, and FDDI drivers.
1.62	15-Oct-1995	mycroft	Use SET(), CLR(), and ISSET() macros. Rename CFCR to LCR, and cache its value. Check MSR before transmitting, for better flow control. Preserve LCR_SBREAK inside comparam().
1.61	04-Jul-1995	mycroft	Fix a condition where ttywait() wouldn't be woken up. Also, short-circuit the case of no pending input in compoll().
1.60	28-Jun-1995	cgd	note that most of dev/ic's contents have changed names
1.59	05-Jun-1995	mycroft	Various: * Check for CTS in the correct register. * Only do a selwakeup() if we output something. * Don't make assumptions about what TTYDISC does.
1.58	04-Jun-1995	mycroft	Handle BREAK correctly when not entering DDB.
1.57	04-Jun-1995	mycroft	Add an input FIFO, and fix several flow control problems. Based on code from Felix A. Croes.
1.56	01-Jun-1995	jtc	Changed ns82450 to ns8250 and dropped ns82550 from probe console messages.
1.55	28-May-1995	mycroft	Only use the `no pending interrupt' bit in the IIR; the other bits are too unreliable on clone chips.
1.54	12-May-1995	cgd	(1) conditionalize debugger usage in comeint with DDB, not COMCONSOLE; latter would lead to undefined symbols if DDB not defined. (2) check for break on console, and therefore debugger entry (if ddb in kernel) earlier, so that the device doesn't need to be open. (3) return immediately after breaking into the debugger in comeint(). (4) only do the normal character input routine in comintr if receive mask yeilds _EXACLTY_ LSR_RXRDY. if there's only a receive error, or there's a receive error _and_ a received character, do comeint(). (former two by me. latter two from Bob Baron <rvb@cs.cmu.edu>.)
1.53	28-Apr-1995	hpeyerl	<break> --> ddb if defined(comconsole). (if you have a serial console and you hit break, you get ddb).
1.52	19-Apr-1995	mycroft	Fix thinko in previous change.
1.51	19-Apr-1995	mycroft	Garbage collect #includes.
1.50	19-Apr-1995	mycroft	Implement comtty().
1.49	17-Apr-1995	cgd	clean up several ISA device interfaces: autoconfiguration, header inclusion, and interrupt configuration. more work still needs to be done, but it's getting better...
1.48	10-Apr-1995	mycroft	Most of the console functions return void. Also change interrupt logic slightly.
1.47	29-Jan-1995	cgd	lip service to making ISA support machine-independent. This is the first round: moving the drivers into a machine-independent directory. Some drivers (e.g. fd.c) not moved because they use other pc features (e.g. CMOS settings), and none of the non-driver files moved, because they're still pretty much PC specific. eventually (when other ports with ISA busses really start using this code), more 'high-level' ISA support will live here.
1.46	29-Jan-1995	cgd	use chip headers in /dev/ic
1.45	11-Jan-1995	pk	Explicitly test the RXRDY status bit on incoming characters.
1.44	04-Jan-1995	mycroft	Fix oversight in previous.
1.43	03-Jan-1995	mycroft	Add interrupt sharing types.
1.42	25-Nov-1994	mycroft	Minor update for new autoconfig.
1.41	18-Nov-1994	mycroft	Convert port, IRQ, and DRQ numbers to ints.
1.40	03-Nov-1994	mycroft	Update to match autoconfig code.
1.39	30-Oct-1994	cgd	be more careful with types, also pull in headers where necessary.
1.38	27-Oct-1994	cgd	new RCS ID format.
1.37	26-Oct-1994	mycroft	Implement *cnpollc().
1.36	16-Sep-1994	mycroft	Only reset FIFO if changing baud rate. From John Kohl (slightly edited).
1.35	24-Aug-1994	mycroft	Set the FIFO threshold based on the receive speed, per Mark Weaver.
1.34	21-Aug-1994	mycroft	Look for MDMBUF in cflag, not lflag.
1.33	07-Aug-1994	mycroft	Count up the silo overflows and only log a warning at most once per minute.
1.32	31-Jul-1994	mycroft	Bug fixes from Mark Weaver.
1.31	10-Apr-1994	cgd	branches: 1.31.2; allow MDMBUF flags to be set (oops)
1.30	07-Apr-1994	mycroft	Implement dynamic IRQ configuration and IRQ sharing. Inline spl*() calls. Reorganize and clean up the relevant code.
1.29	29-Mar-1994	mycroft	Updates for new autoconfig.
1.28	25-Mar-1994	mycroft	Fix off-by-one error in comopen() unit number sanity check. From Brian de Alwis.
1.27	23-Mar-1994	mycroft	Some stylistic cleanup, and a very minor speedup.
1.26	23-Mar-1994	cgd	add AST-style serial multiport support, from Roland McGrath <roland@@frob.com>. Needs light clean by Mr. I386, but mostly OK. For some reason, Bad Things (TM) happened on the last cvs commit.
1.25	18-Mar-1994	cgd	add reasonable support for MDMBUF output flow control. input to be done later
1.24	12-Mar-1994	cgd	copy appropriate hardware config bits from config's flags
1.23	12-Mar-1994	cgd	fix some of the last; thanks to charles for looking it over...
1.22	12-Mar-1994	cgd	support new ioctls. fix the way CRTSCTS is used, etc. Seperate 'hardware' and 'software' flags. beginnings of multiport support.
1.21	08-Mar-1994	mycroft	Major cleanup and many bugs fixed; based in part on Brad Huntting's version for BSD/386. More to be done when the low-level interrupt system is replaced.
1.20	06-Mar-1994	mycroft	DELAY() --> delay(). This is not a macro.
1.19	09-Feb-1994	mycroft	All ioctl routines take a struct proc * now.
1.18	01-Feb-1994	cgd	oops
1.17	01-Feb-1994	cgd	new cons.h location, etc.
1.16	30-Jan-1994	ws	Traditional behaviour is to reset all modes if device isn't open already
1.15	13-Jan-1994	mycroft	Junk comselect(); it's the same at ttselect().
1.14	20-Dec-1993	mycroft	Canonicalize all #includes, and add pio.h where appropriate.
1.13	29-Sep-1993	cgd	ifdef out the ttyfree()'s, so that fill_eproc doesn't panic when a process's session still holds a ref to a tty which has been deallocated and reused.
1.12	29-Aug-1993	deraadt	branches: 1.12.2; tty XXstart() routines return void
1.11	12-Jul-1993	mycroft	Change tty code to use clist interface, but with ring buffer implementation. Also, fix a couple of bugs in tty.c and pccons.c, and some gross kluginess in the hp300 stuff.
1.10	07-Jul-1993	deraadt	pccons.c now dynamically allocates it's "struct tty" cons.c's "struct tty *cn_tty" wasn't used by any of the kernel, and goes away.
1.9	06-Jun-1993	cgd	make getc() and ungetc() be rb{un,}getc(), so getc() and ungetc() don't conflict w/ansi prototypes...
1.8	26-May-1993	deraadt	tty dynamic allocation
1.7	18-May-1993	cgd	make kernel select interface be one-stop shopping & clean it all up.
1.6	10-Apr-1993	glass	fixed to be compliant, subservient, and to take advantage of the newly hacked config(8)
1.5	09-Apr-1993	cgd	have probe return size of io space on successful return, rather than simply 1.
1.4	08-Apr-1993	deraadt	dmesg output at boottime now tries to print out information as soon as it is available. The output looks much more like Sunos.
1.3	27-Mar-1993	cgd	moved closing #endif to include comselect
1.2	21-Mar-1993	cgd	after 0.2.2 "stable" patches applied
1.1	21-Mar-1993	cgd	branches: 1.1.1; Initial revision
1.1.1.1	21-Mar-1993	cgd	initial import of 386bsd-0.1 sources
1.12.2.17	01-Feb-1994	mycroft	Updates from main branch.
1.12.2.16	29-Oct-1993	mycroft	Minor cleanup.
1.12.2.15	29-Oct-1993	mycroft	c_cflag is a tcflag_t, not a u_char. (Duh.)
1.12.2.14	18-Oct-1993	mycroft	Fix a small typo.
1.12.2.13	18-Oct-1993	mycroft	Check bits in the fifo reg during probe to make sure they are on.
1.12.2.12	17-Oct-1993	mycroft	Minor cleanup.
1.12.2.11	16-Oct-1993	mycroft	Add missing dv_class entry to cfdrivers, and use dv_xname where appropriate.
1.12.2.10	15-Oct-1993	mycroft	Nuke a wakeup() I left in accidentally.
1.12.2.9	15-Oct-1993	mycroft	Flush any pending I/O on open. After a transmit interrupt, don't call comstart() if TS_FLUSH is set.
1.12.2.8	13-Oct-1993	mycroft	Use stupid indirection to avoid a compiler warning.
1.12.2.7	12-Oct-1993	mycroft	Minor cleanup.
1.12.2.6	11-Oct-1993	mycroft	#include pio.h where needed, and remove cpufunc.h.
1.12.2.5	07-Oct-1993	mycroft	Don't #include isa.h.
1.12.2.4	06-Oct-1993	mycroft	Change comforceintr() to not use loopback. Change attach messages.
1.12.2.3	30-Sep-1993	mycroft	Change some uses of IRQUNK to IRQNONE. #include isa.h and icu.h.
1.12.2.2	30-Sep-1993	mycroft	clock.c: Remove unnecessary casts. com.c: Update for new config. Add bis() and bic() macros like BSDI's. Add comspeed() and tiocm_xxx2mcr() from BSDI. comreg.h: Add COM_FREQ, COM_TOLERANCE, and COM_NPORTS. fd.c: Remove casts and clean up fdioctl(). [lm]ms.c: Add necessary gunk to [lm]ms_softc and remove casts.
1.12.2.1	14-Sep-1993	mycroft	New i386 code.
1.31.2.5	16-Sep-1994	cgd	from trunk.
1.31.2.4	24-Aug-1994	mycroft	update from trunk
1.31.2.3	21-Aug-1994	mycroft	update from trunk
1.31.2.2	07-Aug-1994	mycroft	update from trunk
1.31.2.1	01-Aug-1994	cgd	From trunk.
1.82.4.3	16-Feb-1997	rat	Patch supplied by Charles Hannmum.
1.82.4.2	10-Dec-1996	mycroft	From trunk: Set serial port parameters sanely for a serial console.
1.82.4.1	02-Jun-1996	mrg	pull up tty stats "bug fix".
1.102.2.4	14-Oct-1997	thorpej	Update marc-pcmcia branch from trunk.
1.102.2.3	22-Sep-1997	thorpej	Update marc-pcmcia branch from trunk.
1.102.2.2	27-Aug-1997	thorpej	Update marc-pcmcia branch from trunk.
1.102.2.1	23-Aug-1997	thorpej	Update marc-pcmcia branch from trunk.
1.113.2.2	16-Oct-1997	thorpej	Sync w/ trunk.
1.113.2.1	16-Oct-1997	thorpej	file com.c was added on branch marc-pcmcia on 1997-10-16 00:04:07 +0000
1.118.2.5	05-May-1998	mycroft	Pull up 1.136-1.138, per request of scottr.
1.118.2.4	17-Dec-1997	mellon	Pull rev 1.129 up from trunk (mycroft)
1.118.2.3	04-Nov-1997	mellon	Pull up rev 1.120 through 1.128 (mycroft)
1.118.2.2	30-Oct-1997	mellon	Pull rev 1.119 up from trunk (drochner)
1.118.2.1	21-Oct-1997	mellon	file com.c was added on branch netbsd-1-3 on 1997-10-30 23:22:55 +0000
1.159.2.4	08-Feb-2000	he	Pull up revisions 1.167-1.168 (requested by jonathan): Properly catch PPS signals on DCD transitions, even if DCD is otherwise ignored.
1.159.2.3	20-Jan-2000	he	Pull up revisions 1.162-1.163 (requested by jonathan): Fix TIMEVAL/TIMESPEC botches and update to the -05 draft version of the PPS-API specification.
1.159.2.2	05-Jan-2000	he	Pull up revision 1.165 (requested by drochner): Set carrier early enough for a serial console or kgdb to work with hardware handshake. Fixes PR#6547.
1.159.2.1	19-Apr-1999	perry	branches: 1.159.2.1.2; pullup 1.159->1.161 -- requested by ross. apparently fixes critical bugs on a number of ports.
1.159.2.1.2.1	21-Jun-1999	thorpej	Sync w/ -current.
1.161.2.1	27-Dec-1999	wrstuden	Pull up to last week's -current.
1.162.4.1	15-Nov-1999	fvdl	Sync with -current
1.162.2.3	18-Jan-2001	bouyer	Sync with head (for UBC+NFS fixes, mostly).
1.162.2.2	22-Nov-2000	bouyer	Sync with HEAD.
1.162.2.1	20-Nov-2000	bouyer	Update thorpej_scsipi to -current as of a month ago A i386 GENERIC kernel compiles without the siop, ahc and bha drivers (will be updated later). i386 IDE/ATAPI and ncr work, as well as sparc/esp_sbus. alpha should work as well (untested yet). siop, ahc and bha will be updated once I've updated the branch to current -current, as well as machine-dependant code.
1.183.2.11	11-Nov-2002	nathanw	Catch up to -current
1.183.2.10	17-Sep-2002	nathanw	Catch up to -current.
1.183.2.9	01-Aug-2002	nathanw	Catch up to -current.
1.183.2.8	17-Apr-2002	nathanw	Catch up to -current.
1.183.2.7	01-Apr-2002	nathanw	Catch up to -current. (CVS: It's not just a program. It's an adventure!)
1.183.2.6	08-Jan-2002	nathanw	Catch up to -current.
1.183.2.5	14-Nov-2001	nathanw	Catch up to -current.
1.183.2.4	21-Sep-2001	nathanw	Catch up to -current.
1.183.2.3	24-Aug-2001	nathanw	Catch up with -current.
1.183.2.2	21-Jun-2001	nathanw	Catch up to -current.
1.183.2.1	05-Mar-2001	nathanw	Initial commit of scheduler activations and lightweight process support.
1.186.2.6	10-Oct-2002	jdolecek	sync kqueue with -current; this includes merge of gehenna-devsw branch, merge of i386 MP branch, and part of autoconf rototil work
1.186.2.5	06-Sep-2002	jdolecek	sync kqueue branch with HEAD
1.186.2.4	23-Jun-2002	jdolecek	catch up with -current on kqueue branch
1.186.2.3	10-Jan-2002	thorpej	Sync kqueue branch with -current.
1.186.2.2	13-Sep-2001	thorpej	Update the kqueue branch to HEAD.
1.186.2.1	25-Aug-2001	thorpej	Merge Aug 24 -current into the kqueue branch.
1.188.2.5	13-Oct-2001	fvdl	Revert the t_dev -> t_devvp change in struct tty. The way that tty structs are currently used (especially by console ttys) aren't ready for it, and this will require quite a few changes.
1.188.2.4	01-Oct-2001	fvdl	Catch up with -current.
1.188.2.3	26-Sep-2001	fvdl	* add a VCLONED vnode flag that indicates a vnode representing a cloned device. * rename REVOKEALL to REVOKEALIAS, and add a REVOKECLONE flag, to pass to VOP_REVOKE * the revoke system call will revoke all aliases, as before, but not the clones * vdevgone is called when detaching a device, so make it use REVOKECLONE to get rid of all clones as well * clean up all uses of VOP_OPEN wrt. locking. * add a few VOPS to spec_vnops that need to do something when it's a clone vnode (access and getattr) * add a copy of the vnode vattr structure of the original 'master' vnode to the specinfo of a cloned vnode. could possibly redirect getattr to the 'master' vnode, but this has issues with revoke * add a vdev_reassignvp function that disassociates a vnode from its original device, and reassociates it with the specified dev_t. to be used by cloning devices only, in case a new minor is allocated. * change all direct references in drivers to v_devcookie and v_rdev to vdev_privdata(vp) and vdev_rdev(vp). for diagnostic purposes when debugging race conditions that still exist wrt. locking and revoking vnodes. * make the locking state of a vnode consistent when passed to d_open and d_close (unlocked). locked would be better, but has some deadlock issues
1.188.2.2	18-Sep-2001	fvdl	Various changes to make cloning devices possible: * Add an extra argument (struct vnode *) to VOP_OPEN. If it is not NULL, specfs will create a cloned (aliased) vnode during the call, and return it there. The caller should release and unlock the original vnode if a new vnode was returned. The new vnode is returned locked. Add a flag field to the cdevsw and bdevsw structures. DF_CLONING indicates that it wants a new vnode for each open (XXX is there a better way? devprop?) * If a device is cloning, always call the close entry point for a VOP_CLOSE. Also, rewrite cons.c to do the right thing with vnodes. Use VOPs rather then direct device entry calls. Suggested by mycroft@ Light to moderate testing done an i386 system (arch doesn't matter though, these are MI changes).
1.188.2.1	07-Sep-2001	thorpej	Commit my "devvp" changes to the thorpej-devvp branch. This replaces the use of dev_t in most places with a struct vnode *. This will form the basic infrastructure for real cloning device support (besides being architecurally cleaner -- it'll be good to get away from using numbers to represent objects).
1.189.2.1	12-Nov-2001	thorpej	Sync the thorpej-mips-cache branch with -current.
1.196.4.1	06-Apr-2004	tron	Pull up revision 1.225 (requested by enami in ticket #1658): Fix race condition introduced in rev 1.189; after the change, if there is THRE interrupt occurs between the LSR read and IIR read, we won't see the LSR_TXRDY bit when testing it in the variable `lsr' and we don't interrupted again (as the corresponding bit in the IIR is cleared by reading, except for some broken device). Tested by Matthias Scheler and me, reviewed by Allen Briggs. Closes PR#25010.
1.196.2.2	29-Aug-2002	gehenna	catch up with -current.
1.196.2.1	16-May-2002	gehenna	Add the character device switch. Replace the access to devsw table with calling devsw API.
1.216.2.7	10-Nov-2005	skrll	Sync with HEAD. Here we go again...
1.216.2.6	04-Mar-2005	skrll	Sync with HEAD. Hi Perry!
1.216.2.5	21-Sep-2004	skrll	Fix the sync with head I botched.
1.216.2.4	18-Sep-2004	skrll	Sync with HEAD.
1.216.2.3	12-Aug-2004	skrll	Sync with HEAD.
1.216.2.2	03-Aug-2004	skrll	Sync with HEAD
1.216.2.1	02-Jul-2003	darrenr	Apply the aborted ktrace-lwp changes to a specific branch. This is just for others to review, I'm concerned that patch fuziness may have resulted in some errant code being generated but I'll look at that later by comparing the diff from the base to the branch with the file I attempt to apply to it. This will, at the very least, put the changes in a better context for others to review them and attempt to tinker with removing passing of 'struct lwp' through the kernel.
1.224.2.2	05-Jul-2004	he	branches: 1.224.2.2.2; Pull up revisions 1.228-1.230 (requested by mycroft in ticket #603): Incorporate 4 changes: o At high speed, set the FIFO trigger to a higher value to reduce interrupt load. Fixes PR#15448. o Handle the case of IIR=RXRDY and LSR=!LSR_RCV_MASK differently, to avoid a hang with some chips. Fixes PR#21184, and possibly PR#10974 and PR#8248. o Remove the extra wait at the end of com_common_putc(), after writing a character out, so that we get another TXRDY interrupt. This prevents stalls when normal output and kernel output are mixed. Fixes PR#4263. o Do not ``preload'' the TX FIFO; wait for a TXRDY interrupt to come in after enabling it.
1.224.2.1	06-Apr-2004	jmc	Pullup rev 1.225 (requested by enami in ticket #70) Fix race condition introduced in rev 1.189; after the change, if there is THRE interrupt occurs between the LSR read and IIR read, we won't see the LSR_TXRDY bit when testing it in the variable 'lsr' and we don't get interrupted again (as the corresponding bit in the IIR is cleared by reading, except for some broken devices). PR#25010
1.224.2.2.2.1	01-Dec-2007	bouyer	Pull up following revision(s) (requested by is in ticket #11394): sys/dev/ic/com.c: revision 1.233 Revert the part of revision 1.228 that made HW_NO_TXPRELOAD the default: it appears to break output on the Soekris net4501, which is a rather popular platform. This should fix PR kern/29612.
1.231.6.1	19-Mar-2005	yamt	sync with head. xen and whitespace. xen part is not finished.
1.231.4.1	29-Apr-2005	kent	sync with -current
1.232.2.1	01-Dec-2007	bouyer	Pull up following revision(s) (requested by is in ticket #1882): sys/dev/ic/com.c: revision 1.233 Revert the part of revision 1.228 that made HW_NO_TXPRELOAD the default: it appears to break output on the Soekris net4501, which is a rather popular platform. This should fix PR kern/29612.
1.234.2.9	17-Mar-2008	yamt	sync with head.
1.234.2.8	04-Feb-2008	yamt	sync with head.
1.234.2.7	21-Jan-2008	yamt	sync with head
1.234.2.6	07-Dec-2007	yamt	sync with head
1.234.2.5	27-Oct-2007	yamt	sync with head.
1.234.2.4	03-Sep-2007	yamt	sync with head.
1.234.2.3	26-Feb-2007	yamt	sync with head.
1.234.2.2	30-Dec-2006	yamt	sync with head.
1.234.2.1	21-Jun-2006	yamt	sync with head.
1.239.2.2	01-Mar-2006	yamt	sync with head.
1.239.2.1	15-Jan-2006	yamt	sync with head.
1.240.4.3	01-Jun-2006	kardel	Sync with head.
1.240.4.2	22-Apr-2006	simonb	Sync with head.
1.240.4.1	04-Feb-2006	simonb	Adapt for timecounters and newer PPS API.
1.240.2.1	09-Sep-2006	rpaulo	sync with head
1.241.6.2	24-May-2006	tron	Merge 2006-05-24 NetBSD-current into the "peter-altq" branch.
1.241.6.1	31-Mar-2006	tron	Merge 2006-03-31 NetBSD-current into the "peter-altq" branch.
1.241.4.3	19-Apr-2006	elad	sync with head.
1.241.4.2	10-Mar-2006	elad	generic_authorize() -> kauth_authorize_generic().
1.241.4.1	08-Mar-2006	elad	Adapt to kernel authorization KPI.
1.241.2.4	11-Aug-2006	yamt	sync with head
1.241.2.3	26-Jun-2006	yamt	sync with head.
1.241.2.2	24-May-2006	yamt	sync with head.
1.241.2.1	01-Apr-2006	yamt	sync with head.
1.243.2.1	19-Jun-2006	chap	Sync with head.
1.244.2.6	13-Jul-2006	gdamore	Merge from HEAD.
1.244.2.5	17-Jun-2006	gdamore	Yes, I'm restoring COM_INIT_REGS and removing the compatibility #define's for sc_iot and friends. Those defines break things, like say ast.c, where comvar.h is included, but a local sc_iot structure member is also used.
1.244.2.4	17-Jun-2006	gdamore	Per tsutsui@, I'm removing COM_INIT_REGS, and adding a flag to make the map initialization automatic. This breaks this whole tree again, so I pretty much have to start over going back thru old code to make it all compatible.
1.244.2.3	16-Jun-2006	gdamore	KNF per simonb@ consisting of: regs.xx -> regs.cr_xxx wrap COM_INIT_REGS body with do { } while (0);) Convert INB/OUTB macros to CSR_READ/CSR_WRITE macros per tsutsui@.
1.244.2.2	15-Jun-2006	gdamore	Fix a type where comconsregs was defined twice, and comkgdregs was missing. Thanks to simonb@ Doh!
1.244.2.1	15-Jun-2006	gdamore	Initial com framework changes. These changes bust all com consumers, but follow-up commits shortly will fix many of them, so that i386, sparc, and some evbmips ports at least work.
1.250.2.1	07-Sep-2006	riz	Pull up following revision(s) (requested by martin in ticket #118): sys/dev/ic/com.c: revision 1.251 fix a GCC uninitialised variable warning only seen at -O3.
1.251.4.2	10-Dec-2006	yamt	sync with head.
1.251.4.1	22-Oct-2006	yamt	sync with head
1.251.2.2	12-Jan-2007	ad	Sync with head.
1.251.2.1	18-Nov-2006	ad	Sync with head.
1.258.2.1	12-Mar-2007	rmind	Sync with HEAD.
1.259.4.1	11-Jul-2007	mjf	Sync with head.
1.259.2.3	23-Oct-2007	ad	Sync with head.
1.259.2.2	01-Jul-2007	ad	- Generic soft interrupts are mandatory, remove the kludges. - Adapt to callout API change. - Use mutexes.
1.259.2.1	17-Jun-2007	ad	- Increase the number of thread priorities from 128 to 256. How the space is set up is to be revisited. - Implement soft interrupts as kernel threads. A generic implementation is provided, with hooks for fast-path MD code that can run the interrupt threads over the top of other threads executing in the kernel. - Split vnode::v_flag into three fields, depending on how the flag is locked (by the interlock, by the vnode lock, by the file system). - Miscellaneous locking fixes and improvements.
1.261.6.4	09-Dec-2007	jmcneill	Sync with HEAD.
1.261.6.3	21-Nov-2007	joerg	Sync with HEAD.
1.261.6.2	26-Oct-2007	joerg	Sync with HEAD. Follow the merge of pmap.c on i386 and amd64 and move pmap_init_tmp_pgtbl into arch/x86/x86/pmap.c. Modify the ACPI wakeup code to restore CR4 before jumping back into kernel space as the large page option might cover that.
1.261.6.1	03-Sep-2007	jmcneill	Sync with HEAD.
1.261.2.1	03-Sep-2007	skrll	Sync with HEAD.
1.262.4.2	18-Oct-2007	yamt	sync with head.
1.262.4.1	14-Oct-2007	yamt	sync with head.
1.262.2.4	23-Mar-2008	matt	sync with HEAD
1.262.2.3	09-Jan-2008	matt	sync with HEAD
1.262.2.2	06-Nov-2007	matt	sync with HEAD
1.262.2.1	29-Oct-2007	matt	Add support for OMAP specific com type.
1.264.2.2	21-Nov-2007	bouyer	Sync with HEAD
1.264.2.1	25-Oct-2007	bouyer	Sync with HEAD.
1.265.2.3	18-Feb-2008	mjf	Sync with HEAD.
1.265.2.2	27-Dec-2007	mjf	Sync with HEAD.
1.265.2.1	08-Dec-2007	mjf	Sync with HEAD.
1.266.2.2	26-Dec-2007	ad	Sync with head.
1.266.2.1	08-Dec-2007	ad	Sync with head.
1.267.4.3	23-Jan-2008	bouyer	Sync with HEAD.
1.267.4.2	08-Jan-2008	bouyer	Sync with HEAD
1.267.4.1	02-Jan-2008	bouyer	Sync with HEAD
1.272.6.4	17-Jan-2009	mjf	Sync with HEAD.
1.272.6.3	28-Sep-2008	mjf	Sync with HEAD.
1.272.6.2	02-Jun-2008	mjf	Sync with HEAD.
1.272.6.1	03-Apr-2008	mjf	Sync with HEAD.
1.272.2.1	24-Mar-2008	keiichi	sync with head.
1.278.2.1	18-May-2008	yamt	sync with head.
1.279.2.5	11-Aug-2010	yamt	sync with head.
1.279.2.4	11-Mar-2010	yamt	sync with head
1.279.2.3	16-May-2009	yamt	sync with head
1.279.2.2	04-May-2009	yamt	sync with head.
1.279.2.1	16-May-2008	yamt	sync with head.
1.281.6.2	13-Dec-2008	haad	Update haad-dm branch to haad-dm-base2.
1.281.6.1	19-Oct-2008	haad	Sync with HEAD.
1.281.4.1	18-Jul-2008	simonb	Sync with head.
1.281.2.1	18-Sep-2008	wrstuden	Sync with wrstuden-revivesa-base-2.
1.286.14.1	07-Jan-2011	matt	Let's cons.c poll and so don't loop until a chacater becomes available.
1.286.10.2	20-May-2011	matt	Fix early boot on AU1x type com ports.
1.286.10.1	13-Sep-2009	cliff	when attaching com, (frequency == -1) means leave the BRG divisor as-is (inherit values established by firmware)
1.286.2.1	19-Jan-2009	skrll	Sync with HEAD.
1.287.2.1	13-May-2009	jym	Sync with HEAD. Commit is split, to avoid a "too many arguments" protocol error.
1.294.2.2	17-Aug-2010	uebayasi	Sync with HEAD.
1.294.2.1	30-Apr-2010	uebayasi	Sync with HEAD.
1.295.2.3	31-May-2011	rmind	sync with head
1.295.2.2	05-Mar-2011	rmind	sync with head
1.295.2.1	30-May-2010	rmind	sync with head
1.298.4.1	08-Feb-2011	bouyer	Sync with HEAD
1.298.2.1	06-Jun-2011	jruoho	Sync with HEAD.
1.301.4.4	22-May-2014	yamt	sync with head. for a reference, the tree before this commit was tagged as yamt-pagecache-tag8. this commit was splitted into small chunks to avoid a limitation of cvs. ("Protocol error: too many arguments")
1.301.4.3	23-Jan-2013	yamt	sync with head
1.301.4.2	23-May-2012	yamt	sync with head.
1.301.4.1	17-Apr-2012	yamt	sync with head
1.303.2.3	02-Jun-2012	mrg	sync to latest -current.
1.303.2.2	29-Apr-2012	mrg	sync to latest -current.
1.303.2.1	18-Feb-2012	mrg	merge to -current.
1.304.2.1	22-Apr-2012	riz	Pull up following revision(s) (requested by christos in ticket #190): sys/dev/ic/com.c: revision 1.305 don't include<sys/rnd.h> before we define cn_trap, because it might bring in<sys/systm.h>
1.306.2.4	03-Dec-2017	jdolecek	update from HEAD
1.306.2.3	20-Aug-2014	tls	Rebase to HEAD as of a few days ago.
1.306.2.2	23-Jun-2013	tls	resync from head
1.306.2.1	25-Feb-2013	tls	resync with head
1.310.4.2	18-May-2014	rmind	sync with head
1.310.4.1	28-Aug-2013	rmind	sync with head
1.323.2.2	10-Aug-2014	tls	Rebase.
1.323.2.1	07-Apr-2014	tls	Be a little more clear and consistent about harvesting entropy from devices: 1) deprecate RND_FLAG_NO_ESTIMATE 2) define RND_FLAG_COLLECT_TIME, RND_FLAG_COLLECT_VALUE 3) define RND_FLAG_ESTIMATE_TIME, RND_FLAG_ESTIMATE_VALUE 4) define RND_FLAG_DEFAULT: RND_FLAG_COLLECT_TIME\| RND_FLAG_COLLECT_VALUE\|RND_FLAG_ESTIMATE_TIME 5) Make entropy harvesting from environmental sensors a little more generic and remove it from individual sensor drivers. 6) Remove individual open-coded delta-estimators for values from a few places in the tree (uvm, environmental drivers). 7) 0 -> RND_FLAG_DEFAULT, actually gather entropy from various drivers that had stubbed out code, other minor cleanups.
1.327.2.1	22-Jun-2016	snj	Pull up following revision(s) (requested by bouyer in ticket #1178): sys/arch/arm/allwinner/files.awin: revision 1.36 sys/conf/files: revision 1.1159 sys/dev/ic/com.c: revision 1.339 sys/dev/ic/comreg.h: revision 1.25 sys/dev/ic/comvar.h: revision 1.82 sys/dev/ic/ns16550reg.h: revision 1.11 The UART in the allwiner SoCs is not full-compatible with the 16550, and it's not a 16750 either. Like the 16750 it has the IIR_BUSY interrupt, which is triggered when writing to LCR while the chip can't accept it. But unlike the 16750, it has a specific register, HALT, to allow writing to the LCR and divisor registers, and then commit the changes. Tested on an A20 SoC, changing the baud rate while keeping the tty device open and incoming data.
1.329.2.5	28-Aug-2017	skrll	Sync with HEAD
1.329.2.4	29-May-2016	skrll	Sync with HEAD
1.329.2.3	27-Dec-2015	skrll	Sync with HEAD (as of 26th Dec)
1.329.2.2	06-Jun-2015	skrll	Sync with HEAD
1.329.2.1	06-Apr-2015	skrll	Sync with HEAD
1.339.10.1	06-Nov-2017	snj	Pull up following revision(s) (requested by martin in ticket #338): sys/arch/sparc64/dev/sab.c: revision 1.55 sys/dev/ic/com.c: revision 1.345 sys/dev/ic/z8530tty.c: revision 1.132 sys/dev/sun/sunkbd.c: revision 1.30 sys/dev/sun/sunms.c: revision 1.33 sys/sys/tty.h: revision 1.94 As discussed on tech-kern: define a new tty internal state flag: TS_KERN_ONLY Implement it in a few tty drivers. If this flag is set, the underlying hardware is used by another driver and userland has no right to open it. A few uses will appear soon in sys/dev/sun/sun{kbd,ms}.c. -- PR port-sparc64/52622: mark the parent device as TS_KERN_ONLY, so userland will not touch it (and change serial params w/o our control).
1.346.2.4	18-Jan-2019	pgoyette	Synch with HEAD
1.346.2.3	26-Dec-2018	pgoyette	Sync with HEAD, resolve a few conflicts
1.346.2.2	25-Jun-2018	pgoyette	Sync with HEAD
1.346.2.1	16-Apr-2018	pgoyette	Sync with HEAD, resolve some conflicts
1.348.2.3	13-Apr-2020	martin	Mostly merge changes from HEAD upto 20200411
1.348.2.2	08-Apr-2020	martin	Merge changes from current as of 20200406
1.348.2.1	10-Jun-2019	christos	Sync with HEAD
1.356.2.1	29-Feb-2020	ad	Sync with head.
1.361.4.1	03-Apr-2021	thorpej	Sync with HEAD.
1.361.2.1	03-Apr-2021	thorpej	Sync with HEAD.
1.363.2.1	01-Aug-2021	thorpej	Sync with HEAD.

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